mv internal lib

lib/sync/debug.go

@@ -0,0 +1,31 @@
+// Copyright (C) 2015 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package sync
+
+import (
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/calmh/logger"
+)
+
+var (
+	debug     = strings.Contains(os.Getenv("STTRACE"), "locks") || os.Getenv("STTRACE") == "all"
+	threshold = time.Duration(100 * time.Millisecond)
+	l         = logger.DefaultLogger
+)
+
+func init() {
+	if n, err := strconv.Atoi(os.Getenv("STLOCKTHRESHOLD")); debug && err == nil {
+		threshold = time.Duration(n) * time.Millisecond
+	}
+	if debug {
+		l.Debugf("Enabling lock logging at %v threshold", threshold)
+	}
+}